georefid:2001-055229SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2001-055229<gco:CharacterString>Mutabella mirabilis gen. et sp. nov., a Miocene microperforate planktonic foraminifer with an extreme level of intraspecific variability</gco:CharacterString>2001-01-01publicationgeorefid:2001-055229Pearson, Paul N.University of Bristol, Department of Earth Sciences, Bristol, United KingdomauthorNorris, Richard D.Woods Hole Oceanographic Institution, United StatesauthorEmpson, Andrew J.authorCushman Foundation for Foraminiferal Research, Ithaca, NY, United StatespublisherdocumentHardcopyJournal of Foraminiferal Research31 (2)120-132We describe Mutabella mirabilis, a new genus and species of Miocene microperforate planktonic foraminifera. The species is known from several drill sites in the tropical Pacific, Indian and Atlantic Oceans (Deep Sea Drilling Project/Ocean Drilling Program Sites 78, 219, 865, 871, 872, 873, 959, and 960). The taxon shows an unusually high level of intraspecific variability in chamber shape and arrangement, aperture position, and test ornament. Some specimens possess supplementary sutural apertures, which may have bulla-like coverings. Others possess a composite tooth-plate reminiscent of certain Cretaceous species. Mutabella mirabilis first evolved in early Miocene Biochron M3, and probably became extinct in middle Miocene Biochron M7. A morphometric study from Site 872 (west Pacific) demonstrates that substantial shape change occurred during its evolution, related to the height of the trochospiral chamber arrangement and degree of involution of the test. A stable isotopic comparison with other coexisting species indicates that M. mirabilis occupied a shallow (mixed layer) planktonic habitat. A strong positive correlation between test size and delta (super 13) C indicates that it probably associated with photosynthetic symbionts. Mutabella mirabilis seems to have evolved from the long-ranging species Globigerinita glutinata, with which it fully intergrades in morphology near the bottom of its stratigraphic range.completedInvertebrate paleontologyAtlantic Oceanbiochemistrybiologic evolutionbiometrybiostratigraphyCenozoicDeep Sea Drilling ProjectDSDP Site 219DSDP Site 78ForaminiferaGlobigerinaceaGlobigerinitidaehabitatIndian OceanInvertebrataisotopesLeg 143Leg 144Leg 159Leg 23Leg 9microfossilsMiocenemorphologyMutabella mirabilisNeogenenew taxaOcean Drilling ProgramODP Site 865ODP Site 871ODP Site 872ODP Site 873ODP Site 959ODP Site 960Pacific Oceanpaleoecologyplanktonic taxaProtistaRotaliinashallow-water environmentstable isotopessymbiosistaxonomyTertiaryvariationsurn:org.iodp:exp:143urnlargerWorkCitationcampaignurn:org.iodp:exp:144urnlargerWorkCitationcampaignurn:org.iodp:exp:159urnlargerWorkCitationcampaignurn:org.iodp:exp:23urnlargerWorkCitationcampaignurn:org.iodp:exp:9urnlargerWorkCitationcampaignurn:org.iodp:exp:23:site:219urnlargerWorkCitationstudyurn:org.iodp:exp:23urnlargerWorkCitationcampaignurn:org.iodp:exp:9:site:78urnlargerWorkCitationstudyurn:org.iodp:exp:9urnlargerWorkCitationcampaignurn:org.iodp:exp:143:site:865urnlargerWorkCitationstudyurn:org.iodp:exp:143urnlargerWorkCitationcampaignurn:org.iodp:exp:144:site:871urnlargerWorkCitationstudyurn:org.iodp:exp:144urnlargerWorkCitationcampaignurn:org.iodp:exp:144:site:872urnlargerWorkCitationstudyurn:org.iodp:exp:144urnlargerWorkCitationcampaignurn:org.iodp:exp:144:site:873urnlargerWorkCitationstudyurn:org.iodp:exp:144urnlargerWorkCitationcampaignurn:org.iodp:exp:159:site:959urnlargerWorkCitationstudyurn:org.iodp:exp:159urnlargerWorkCitationcampaignurn:org.iodp:exp:159:site:960urnlargerWorkCitationstudyurn:org.iodp:exp:159urnlargerWorkCitationcampaignEnglishgeoscientificInformation-179.3321172.2040-60.000075.0000Atlantic OceanIndian Ocean